Electrochemically Reversible Sodium Intercalation of Layered NaNi0.5Mn0.5O2 and NaCrO2

Komaba, Shinichi; Nakayama, Tetsuri; Ogata, Atsushi; Shimizu, Tomoe; Takei, Chikara; Takada, Sadako; Hokura, Akiko; Nakai, Izumi

doi:10.1149/1.3112727

Cited by 238 publications

(231 citation statements)

References 15 publications

Supporting

Mentioning

209

Contrasting

Unclassified

Order By: Relevance

“…The multi-step nature of the corresponding electrochemical curve, presented in Figure 3a, suggest numerous structural transitions in agreement with the observations reported in the literature 24 . In most of the other NaxMO2 systems (M = Co, V, Cr, Ni...) reported in the literature 6,9,10,[33][34][35][36] , the most important voltage drops occur for the Na1/2MO2 and Na2/3MoO2 compositions which are energetically favorable for sodium/vacancy ordering. The initial sodium content in the starting material NaxMoO2 is therefore reevaluated by fitting the 2.5 V and 1.5 V voltage drops at x= 1/2 and 2/3, respectively.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

The Na_xMoO₂ Phase Diagram (¹/₂ ≤ x < 1): An Electrochemical Devil’s Staircase

Vitoux¹,

Guignard²,

Suchomel³

et al. 2017

Chem. Mater.

View full text Add to dashboard Cite

Layered sodium transition metal oxides represent a complex class of materials that exhibit a variety of properties, e.g. superconductivity, and can feature in a range of applications, e.g. batteries. Understanding the structure-function relationship is key to developing better materials. In this context, the phase diagram of the NaxMoO2 system has been studied using electrochemistry combined with in situ synchrotron X-ray diffraction experiments. The many steps observed in the electrochemical curve of Na2/3MoO2 during cycling in a sodium battery suggests numerous reversible structural transitions during sodium (de)intercalation between Na0.5MoO2 and Na~1MoO2. In situ X-ray diffraction confirmed the complexity of the phase diagram within this domain, thirteen single phase domains with minute changes in sodium contents. Almost all display superstructure or modulation peaks in their X-ray diffraction patterns suggesting the existence of many NaxMoO2 specific phases that are believed to be characterized by sodium/vacancy ordering as well as Mo-Mo bonds and subsequent Mo-O distances patterning in the structures. Moreover, a room temperature triclinic distortion was evidenced in the composition range 0.58 ≤ x < 0.75, for the first time in a sodium layered oxide system. Monoclinic and triclinic subcell parameters were refined for every NaxMoO2 phase identified. Reversible [MoO2] slab glidings occur during the sodium (de)intercalation. This level of structural detail provides unprecedented insight on the phases present and their evolution which may allow each phase to be isolated and examined in more detail.

show abstract

Section: Electrochemical Characterizationmentioning

confidence: 99%

The Na_xMoO₂ Phase Diagram (¹/₂ ≤ x < 1): An Electrochemical Devil’s Staircase

Vitoux¹,

Guignard²,

Suchomel³

et al. 2017

Chem. Mater.

View full text Add to dashboard Cite

show abstract

“…Up to present, numerous cathode materials have been evaluated, such as the P2 or O3-layered oxide Na x MO 2 (0.5 < x < 1, M:Ni, Co, Mn, Fe, Cr, Ti, etc.) [5,6,7,8,9,10,11,12,13,14,15,16,17,18], tunnel-type Na 0.44 MnO 2 [19,20], Na 0.66 [Mn 0.66 Ti 0.34 ]O 2 [21], Na superionic conductor (NASICON)-Na 3 V 2 (PO 4 ) 3 /C [22], ferrocyanide-like copper hexacyanoferrate (CuHCF) [23], nickel and copper hexacyanoferrate (Ni-CuHCF) [24], etc. In contrast, the choices of anode materials for sodium-ion batteries are limited to carbonaceous materials, alloys, Ti-based oxides and some organic compounds.…”

Section: Introductionmentioning

confidence: 99%

High Capacity and High Efficiency Maple Tree-Biomass-Derived Hard Carbon as an Anode Material for Sodium-Ion Batteries

et al. 2018

View full text Add to dashboard Cite

Sodium-ion batteries (SIBs) are in the spotlight because of their potential use in large-scale energy storage devices due to the abundance and low cost of sodium-based materials. There are many SIB cathode materials under investigation but only a few candidate materials such as carbon, oxides and alloys were proposed as anodes. Among these anode materials, hard carbon shows promising performances with low operating potential and relatively high specific capacity. Unfortunately, its low initial coulombic efficiency and high cost limit its commercial applications. In this study, low-cost maple tree-biomass-derived hard carbon is tested as the anode for sodium-ion batteries. The capacity of hard carbon prepared at 1400 °C (HC-1400) reaches 337 mAh/g at 0.1 C. The initial coulombic efficiency is up to 88.03% in Sodium trifluoromethanesulfonimide (NaTFSI)/Ethylene carbonate (EC): Diethyl carbonate (DEC) electrolyte. The capacity was maintained at 92.3% after 100 cycles at 0.5 C rates. The in situ X-ray diffraction (XRD) analysis showed that no peak shift occurred during charge/discharge, supporting a finding of no sodium ion intercalates in the nano-graphite layer. Its low cost, high capacity and high coulombic efficiency indicate that hard carbon is a promising anode material for sodium-ion batteries.

show abstract

“…[35] In K x MO 2 (M = Mn + Co), no extra reflections arising from potassium ordering could be observed, suggesting that the prismatic sites of the interlayer are crystallographically equivalent although the intensity of superstructure reflections may have been too weak to be seen using in operando data. Among the sodium layered oxides with x < 0.2, a range of structures have been reported including faulted P3-type Na 0 Ni 1/2 Mn 1/2 O 2 [38] and rock-salt structured Na 0 CrO 2 . The two structures are related by a gliding of the layers along the [100], [130], or [-130] direction that results in distinctly different coordination environments for K: prisms in P′3 and octahedra in O′3.…”

mentioning

confidence: 99%

Structural Insight into Layer Gliding and Lattice Distortion in Layered Manganese Oxide Electrodes for Potassium‐Ion Batteries

Zhang

Didier

Pang

et al. 2019

Advanced Energy Materials

145

117

View full text Add to dashboard Cite

grids. Current growth rates in lithiumion battery (LIB) manufacturing are not sustainable given our limited lithium resources. In this context, alternative battery systems with low cost are sought, with sodium-and potassium-ion batteries (SIBs and PIBs, respectively) regarded as suitable replacements due to the high natural abundance of sodium and potassium and their similar working mechanism to LIBs. [1] Of these, PIBs are more promising due to the closeness of the K + /K redox potential (−2.9 V vs H + /H 2 O) to that of Li + /Li (−3.0 V vs H + /H 2 O), as compared to Na + /Na (−2.7 V vs H + /H 2 O), and the consequential ease of reversible K + intercalation into the most common LIB negative electrode, graphite. [2][3][4] The slow kinetics of the reversible insertion of K + in electrode materials as a result of its relatively large ionic radius of 1.38 Å is a major issue for the realization of high-performance PIBs. [5][6][7] For PIB technology to be successful, scientists need to find stable electrode materials capable of reversibly hosting K + relatively quickly. Transition metal layered oxides possess a 2D structure that can accommodate large ions and are attracting interest as potential PIB electrode materials. [8][9][10][11][12][13][14] Among these, manganese layered oxides are particularly promising due to the high natural abundance and nontoxicity of manganese. A range of layered K x MnO 2 structure types can be prepared [15,16] including Potassium-ion batteries (PIBs) are an emerging, affordable, and environmentally friendly alternative to lithium-ion batteries, with their further development driven by the need for suitably performing electrode materials capable of reversibly accommodating the relatively large K + . Layer-structured manganese oxides are attractive as electrodes for PIBs, but suffer from structural instability and sluggish kinetics of K + insertion/extraction, leading to poor rate capability. Herein, cobalt is successfully introduced at the manganese site in the K x MnO 2 layered oxide electrode material and it is shown that with only 5% Co, the reversible capacity increases by 30% at 22 mA g -1 and by 92% at 440 mA g -1 . In operando synchrotron X-ray diffraction reveals that Co suppresses Jahn-Teller distortion, leading to more isotropic migration pathways for K + in the interlayer, thus enhancing the ionic diffusion and consequently, rate capability. The detailed analysis reveals that additional phase transitions and larger volume change occur in the Co-doped material as a result of layer gliding, with these associated with faster capacity decay, despite the overall capacity remaining higher than the pristine material, even after 500 cycles. These results assert the importance of understanding the detailed structural evolution that underpins performance that will inform the strategic design of electrode materials for high-performance PIBs.

show abstract

Electrochemically Reversible Sodium Intercalation of Layered NaNi0.5Mn0.5O2 and NaCrO2

Cited by 238 publications

References 15 publications

The Na_xMoO₂ Phase Diagram (¹/₂ ≤ x < 1): An Electrochemical Devil’s Staircase

The Na_xMoO₂ Phase Diagram (¹/₂ ≤ x < 1): An Electrochemical Devil’s Staircase

High Capacity and High Efficiency Maple Tree-Biomass-Derived Hard Carbon as an Anode Material for Sodium-Ion Batteries

Structural Insight into Layer Gliding and Lattice Distortion in Layered Manganese Oxide Electrodes for Potassium‐Ion Batteries

Contact Info

Product

Resources

About

Electrochemically Reversible Sodium Intercalation of Layered NaNi0.5Mn0.5O2 and NaCrO2

Cited by 238 publications

References 15 publications

The NaxMoO2 Phase Diagram (1/2 ≤ x < 1): An Electrochemical Devil’s Staircase

The NaxMoO2 Phase Diagram (1/2 ≤ x < 1): An Electrochemical Devil’s Staircase

High Capacity and High Efficiency Maple Tree-Biomass-Derived Hard Carbon as an Anode Material for Sodium-Ion Batteries

Structural Insight into Layer Gliding and Lattice Distortion in Layered Manganese Oxide Electrodes for Potassium‐Ion Batteries

Contact Info

Product

Resources

About

The Na_xMoO₂ Phase Diagram (¹/₂ ≤ x < 1): An Electrochemical Devil’s Staircase

The Na_xMoO₂ Phase Diagram (¹/₂ ≤ x < 1): An Electrochemical Devil’s Staircase